Wood joint



0. T. THEODORSEN.

WOOD JOINT.

APFLICATION men AUG. I3, 1920.

1,426,232, Pafented Aug. 15,1922.

V UNITED STATES mesmerme.

- omv-rarevn-rnnonoasnn, or cnmsrmma, NORWAY.

woon J'OZliN-T.

his invention relates to joints for wood construction. In these joints a sheet metal plate is introduced between the wooden parts, and bolts, screws or other fastening means are used for holding the wooden parts together.

The peculiar arrangement of the I teeth.

which enter into the parts to be connected,

, is the novelty of the present invention.- The invention has the purpose of rendering the number of teeth larger on the-same size of the sheet metal plate and provides for a more advantageous shape of the teeth. At the same time, it distributesadvantageously the strain in the sheet metal teeth and in the wood, and presents therefore a large resistance against cracking and wearing of the woods, .and also provides sufficient r'igldity against twisting of the bolts. The invention therefore'also deals with the-advantageous method of manufacturing thethat the teeth are cut out at the outer edges and are alternately bent in opposite directions, so as to forman angle with the edge of the sheet metal plate. A plurality of teeth can be formed between each two inci- 'sions. .The incisions can be made by punchingthe material between the teeth or without the removal of the material, so that the teeth become larger and have a greater strength. v

The teeth may be bent at a right angle or atmore than a right angle from the plane of the sheet metal plate. The last named arrangement particularly, results in great advantages in joints between immovably connected members. The force of the joint is increased by the fact that the teethby the sharp strains produced, are pressed deeper into the wood, an it may even be possible to intertwist the bres of the two wooden parts in this way. j

The sheet metal parts may be constructed of a certain predetermined size withteeth on all edges. They may be circular, square Specification of Letters Patent. P t t A 15 2 A pplication tlled August 13, 1920. Serial No. 403,271.

slant to the direction of the fibres and of the pushing force. The invention is illustrated in the drawm s:

igure 1 shows a section through a wooden jointwith the sheet metal plate introduced,

Figure 2 shows the joint according to' Figure 1, seen from the top, the upper part of the-wood being removed, and

Figures 3 and 4 show in side elevation and top plan view, a serrated band.

The, two parts of the wood to be connected, are shown at 1 and 2 in Figure 1.

The serrated sheet 4 is placed between the two parts and the whole joint is connected by 'a bolt 3 having a nut and washers 8 and 9. The sheet metal plate 4 is provided with teeth at its edges. These teeth 5, and

-6 are alternately bent up and down. Figure 2 shows clearly that the teeth form an angle with the edge. The teeth are made by incisions at a right angle to the edge of,

the sheet metal plate, spaced suitably from each other, and these teeth are then formed by bending the tongues alternately in both directions." Between each two inclsions 1,

2 or 3, teeth are formed. The sheet metal plate may be provided with one or several recesses as shown, the edges of these recesses being provided with teeth in the same way I as the outer edge.

Figures 3'and .4 show that the teeth are.

bent at an angle other than a right angle from the plane ofthe sheet. The same arrangement may obviously be used on sheet metal plates, as shown in Figures 1 and 2.

The supporting power of the new joint is not only based on the transmission of force through the teeth, but also on the quality of the sheet metal plate, to prevent the cracking of the wood, whereby the supporting power is also enhanced, and it isfinally also'due to the frictional force. The shape, size and strength of the sheet metal plate the shape, number and form of the recesses,

and the shape, size, arrangement and stren h of the teeth-ma be selected in each se in accordance-with the requirements. The invention is to be used in wooden joints of all sizes, as for instance, in roof construction, bridges, rope railway abutments,

' scafiolding, frame-works, girders, columns,

- joined together.

compound, simple and double Ts for collection of thin wooden plates and the like. The invention is particularly advantageous in timber constructions in which the rods and posts are made of several wooden parts In this case several joint plates may be placed around each bolt connecting the several parts, one joint plate be ing. placed between each of the mentioned parts. The invention also is particularly advantageous in doweledbeams because the supportin power is thereby. increased. Further, t e cost of the invented plates and of the necessary labour for making joints by means thereof will be considerably lower than the cost of making wooden dowels for jointing the parts by means thereof.

What ll claim is 1. A wooden joint comprising wooden members and a sheet metal plate between the wooden members, the sheet metal plate being eeeaea provided at its outer edges with teeth alternately bent in opposite directions, and so arranged that the base of each tooth is-at less than a right angle to the edge of the late. p 2. A joint, as set forth in claim 1, characterized in this that teeth are formed between consecutive incisions. 3. A joint, as set forth in claim 1, characterized in this that the teeth are formed 7 by, incisions without removal of material between the teeth.

4:. A. joint, as set forth in claim 1, characterized in this, that the teeth are bent at an angle greater than a right angle with the plane of the sheet metal plate.

- In testimony whereof I afix my signature in presence of two witnesses;

ULAV TRYGVE THEUDORSJEN Witnesses:

GEORGE Nrcoms Lrr'r, A. 1B. 000K. 

